Dr_Death8,
You seem to have identified a distortion issue caused by the film viewer. However, note that my images above are not from the film viewer, but instead are screen captures taken offline with the 2 tanks parked next to each other. I then processed them in Photoshop. The corrected-height image was processed in photoshop by cutting out the hull and turret, raising them by the indicated amount, then filling in extra track and cleaning up the background.
With respect to the plans, both 1:76 scale plans were placed on the floor, one overlapping the other, and photographed. Other sources of information confirm the accuracy of these plans. Actually, to get picky, look at my corrected-height image. Note how the Panther turret, relative to the hull, looks slightly smaller than in the plan? The turret would probably benefit from being enlarged 5% in all 3 axes (both width and height in the view above).